The modern diesel generator set consists of a diesel engine, a three-phase AC brushless synchronous generator, a control box (screen), a radiator tank, a coupling, a fuel tank, a muffler and a common base. The flywheel housing of the diesel engine and the front end cover of the generator are directly connected by the shoulder positioning, and the cylindrical elastic coupling is used to directly drive the rotation of the generator by the flywheel, and the connection manner is fixed by screws, so that two The joints into a steel body ensure that the concentricity of the crankshaft of the diesel engine and the rotor of the generator is within a prescribed range.